M-18

Mineral districts presented herein and delineated on the enclosed
map were defined according to geological criteria.
The principal goal was to arrange known metallic mineral occurrences
into discreet metallogenic systems of similar age and
style of mineralization. It Is strongly stressed that many of the
metallic occurrences have poorly understood geological controls
and hence, many of the district boundaries will change as
knowledge of both their deposits and geologic settings is improved.
Nevertheless, this map initiates a geological approach to the subject of mine district definition and suggests that mineral districts are ultimately geological phenomena.
Include a map sheet showing the distribution of metallic mineral districts of Arizona, map scale 1:1,000,000.

Publication Date

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